Hero, Four Brides, and Grand Orgy: A Fantasy Harem Erotica Adventure (OP Warrior's Harem Adventure Book 9) by Ennis, P.E.

Zanne and her beautiful sisters Zillian and Zizelle witness Dick making love with their mother... so what? Let them join.

In fact, Zoana, the beautiful MILF mother, orders her daughters to serve Dick too with the hope of getting pregnant.

By the way, Zanne's pregnant now, and Dick is becoming a father for the first time.

And Zoana, the ruler of Sansisco, wants to have Dick's baby too. The two sisters have no choice but to become Dick's brides too, at first reluctantly but soon very much happily.

The wedding takes place a week later, and friends and guests arrive.

And Dick's special friends, Lani the witch, Bora the Boar Lady, Harpie Queen and Princess, Elly, Goldin the Dragon Lady (and her minion Golden Dick) stay for the night.

You can guess what happens there.